From Jersey Infrared Consultants’ Sept/Oct 2016 Newsletter
Online — “A 2015 survey of national roofing contractors indicated that single-ply roof systems (EPDM, TPO, PVC, etc.) accounted for almost 49% of the roofs installed nationwide. These roofing systems can present challenges for thermographers who inspect them due to reflectivity of the roof membrane.
“Should reflectance be sufficiently high, areas of latent moisture may be undetectable to a thermal imager.
“Most infrared inspections of flat or low slope roofing systems are conducted at night by walking across the roof surface using a handheld thermal imager. This technique often results in a relatively shallow viewing angle thereby lowering the emittance of the subject roof membrane.
“Depending upon site conditions and roof materials, roof membranes can appear to be as reflective as polished metal surfaces.
“Membrane reflectivity will be especially noticeable on cool, clear nights that permit the cold night sky to be reflected from the roof surface. It will also be significant on roofs that have been coated with aluminum paint.
“The way to deal with the reflectivity of smooth roof membranes is to utilize a thermal imager with short wave (2 to 5.6 micron) spectral response.
“This will help to eliminate reflections from the roof and can increase inspection accuracy. Although long wave imagers can be used for smooth membranes, they can largely understate the size of moisture-damaged areas or miss them entirely.
“Jersey Infrared Consultants have a wide selection of infrared imagers, including many short wave imagers. The proper selection of equipment and the training and experience of our thermographers ensure your clients the best infrared flat roof moisture survey possible.”
Visit Jersey Infrared Consultants’s FAQs on Thermal Infrared Roof Surveys to learn more (http://www.jerseyir.com/infrared-inspection-service/infrared-flat-roof-moisture-surveys/faqs-about-infrared-flat-roof-moisture-surveys)…
Jersey Infrared Consultants
425 Ellis Street
PO Box 39
Burlington, NJ 08016 USA
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